Fibrosis area measurement
Two thresholds were established to delimit LVA: 0.5mV and 0.3mV. We added the condition of presenting voltages higher than 0.1 mV to avoid areas of dense fibrosis and possible false voltages due to contact problems.
To delimitate LVA extension, we used a tool present in CARTO called “Area Measurement”. With this tool, low voltage extension is manually drawn according to the colour code given by the chosen thresholds. Since this measurement process is performed manually, there may be discrepancies between one measurement and another. In order to eliminate variability, two observers make two measurements of each patient.